Bobbin for electric weft detectors



June 24, 1930. wf wAKEFlELD 1,766,861

BOBBIN FOR ELECTRIC WEFT DETECTORS Filed Aug. 10 1929 E? jNl/E/VTUR WALTER H. WA KEF/ELU Patented June. 24, 1930 entree stares titan FATE WALTER H. WAKEFIELD, OF WORCESTER, MASSACHUSETTS},ASSZFGIJOR 'IO GBOMPTON &

KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A. CORPORATION OF MASSACHUSETTS Application filed August 10,1929. Serial in. 384,268. i i

This invention relates to improvements in bobbins or tubular oops for electrical weft detectors and it is the general object of the invention to incorporate into the construction of the bobbin or cop a metallic foil or similar substance portions of which are exposed to have contact with electrically charged detectorelements.

Paper cops or bobbins are usually formed by winding a sheet of sized paper about a mandrel or other former, the size or adhesive holding theseveral wraps of paper together so thatwhen finishedthere are several coils of paper'wound spirally 011 themselves to present a tube. It isa further object of my present invention tointroduce a strip o'fmetallicv foil between successive wraps of the bobbin and 'toperforate that part of the paper which forms the last wrapor outer layer so that the toil will-be exposed through the perforations for contact with electrical detector elements. It is "a ,more specific object of my invention to provide two groups of detector needlesof opposite electrical charge and to form the bobbin which will appearas the descriptionproceeds my invention resides in the combination and arrangement of parts hereinafter described; and set forthin the claims.

In the accompanying. drawings wherein a woconvenlent embodiments of my present invention areset. forth;

- Fig. l is a perspective vlew showing a weft detector in contact witlranempty bobbin ing the preferred form of the invention, and

" formed according to the preferred form of my present invention. I v I l n Fig. 2s a perspective view show ng'the method of rolling the paper on tself to I form'the preferred form of bobbin,

Fig. 3 is a plan View of the structure shown in Fig. 1 showing the manner of establishing electrical contact betweenthetwo groups of needles, r

Fig. 4 is a development of the paper formg: 5 is a perspective view of a modified form ofbobbin;

' Preparatory to Wrapping or forming the cop I-provide a strip of suitable paper 10' near one corner of which 1 form a series of perforations 11 as shown on Fig. 4. The perforations are so formed that a lineparallel to the axis of the bobbingor edge 12 of paper '10 will always pass through at least one of the perforations. As shown herein I form the paper with two groups of perforations designated in F ig; 1-atl3 "contact with the {previously rolled portion of the cop I may providethe toil with sev- 5 eral openings or slots 18 of suitable form so that a paper to paper contact may be effected within the outline of the foil. Itisto be "understood, however, that the strip of toil 1 1s a continuous piece of current C filIYl-Ilgnltl- -".-'.5

terialland the openings'fare so located: as i not to come oppositefanyof the perforations 11. When finished the perforations will-be,

' evenly distributed around the periphery of the cop.

[The detector to cooperate. with ymy proved bobbin is set' forth in Figs. land 3 and comprises a base 7 20 ofinsul'ati'ng ma terial on wh ch ismoun'ted a-pair of de "tector holders 21 and 22 to correspond, re" spectively, to the postive'and negative. sides of an electric circuit not shown; Each of said holders has a foot23; and an upright 24: from which 'rearwardly projects a-,-guide 25; As set forth herein there are two groups 26 and 31, respectively,-each having siXinetallic wires-26slidably mounted in the corresponding guide 25. The forwarde'nd of eachwire is provided with a crimp or ofiset 27 which acts as a-stop to. limit rearward of weights 30. There is oneweight for each} of the wires and the wires are so disposed and offset relative to the pivot pin 29 that they hold the wires 26 yieldingly in rear position. I

It is to be understood that the holders 21 and 22 are substantially identical so that two groups of wires are provided, one corresponding to the negative side of the circuit and the other for the positive side..

Each holder has a binding post 32 to receive the corresponding wire.

In operation the wires of each group will present substantially a straight line at their rear ends and the groups will be sufficiently wide to cooperate with the groups 13 and 1%. When sufficient weft for continued weave is present a majority of the holes willbe covered, at least the holes of the group 18 near the butt of the bobbin will 20 be under the mass of yarn remaining on the bobbin. Then the supply of weft is depleted, however, the holes of the two groups will be uncoveredand one or another of the wires of each group will be permitted to pass through one of the holes of the corresponding group of perforations in the cop. Inasmuch asthis affords contact between each group of wires and the .metal foil 15, said groups will be electrically connected and. therefore current can flow from the holder 21 through'the contacting --wire 26, foil 15 and back from the bobbin 1 through the contacting wire 31 to the holder 22, thereby closing the circuit which is ex- 35 ternal to the detector but not set forth therein. i

It is to be understood that the wires and -holders or supports therefor are of current conducting material so that current may flowfrom thee'xternal circuit through the ,holder and through any of the wires into the foil 15,. The detector set forth herein Y is merely for illustrative purposes only and it is to be understood that my present invention relates to the bobbin or cop. The

v arrangement of the perforations and the relation which they bear to the wires is-very similar to that shown in the prior patent -to Ryon No. 1,221,768. I

In theform of the bobbin already described it is possible to place the weft carrier in the shuttle in any; angular, position butiwhere stopping of the loom is the effect achieved by the detector it is possible to em- '55 .ploy a modified and simpler type of bobbin -such as shown in Fig. 5. In this latter form of bobbin asmall'slot lO is provided in the cop to cooperate either with a part of the shuttle spindle not shownorto per i mit the weaver to place the bobbin in the shuttle in a predetermined angular position. When so constructed the bobbin may have two elongated openings a1 and A2 on the front side thereof which afford. opportunity 'for the detector-electrodes toahave contact with a foil plate 4.3 held in position substantially the same as is plate 15 in the pre- 'is held in position very securely because of the fact that it is wound between the coils of paper of which the bobbin is made. .It will further be understood that there is a suflicient depth of paper under the foil to prevent the latter; from being penetrated or disrupted by the wires. Again, it will be seen because of the arrangement of the perforations in the preferred form the bobbin may be placed in any angular position relative to the shuttle and the wires will be able to cooperate properly therewith. Where the filling detector operates to'stop the loom the modified form of the cop maybe used.

Having thus described my invention it will be apparent that changes and modifications may be made therein by those skilled in the art without departing from the spirit andlscope of the invention 'and I do not wish to be limited to the details herein disclosed but what I claim is:

1. A weft cop formed of a sheet of-paper wound on itself to form a tube, a sheet of metallic foil locatedbetween successive winds of the paper, the last'wrap of the paper havinga perforation through which the foil is accessible'to an electricweft'detector. 2. A weft cop formed of a sheet of paper wrapped on itself, there being a per-foration in the last wrapof the pa er, and an electric current conducting su stance located between thelast two wraps of the paper and accessible toan electric weft detector through the perforation. 1

3. A weft cop formed of a sheet of paper wrapped on itself, an electriccurrentlconducting material interposedbetween the last two wraps of paper, a portion of the last wrap being removed to render the material accessible to an electric'weft detector.

. a. A weft cop formed of a sheet ofpaper wrapped 011 itself,fa sheet of metallic substance interposed between successive wraps of the paper,portions of the'paper 'being removed 'to render the metallic substance accessible to an electric weft detector.

5. Aweft cop formed of a sheet of paper wrapped on itself, an electric current carrying material interposed between successive wraps of the paper, portions: ofthe .paper being removed to render the material accessible to an electric weft detector.

6. A weft cop formed of a sheet of paper Wrapped on itself, a sheet of metallic substance interposed between successive Wraps of the paper, portions of the paper being removed to render the metallic substance accessible to an electric Weft detector, the sheet of metallic substance being perforated to prevent adhesion of successive Wraps of the paper through said perforated part of the sheet of metallic substance.

7. A Weft cop formed of a sheet of paper Wrapped on itself, anelectric current conducting substance interposed between successive Wraps of the paper,portions of the paper being removed around the periphery of the cop to render the substance accessible to an electric Weft detector in any angular 00 position the cop may assume relatively to the detector. V

In testimony whereof I have hereunto affixed my signature.

' WALTER H. WAKEFIELD. 

